\documentclass[12pt]{standalone}
\usepackage{mathptmx}
\usepackage{tikz}
%\usepackage{color}
\usepackage[active,pdflatex,tightpage]{preview}
\PreviewEnvironment[]{tikzpicture}
\PreviewEnvironment[]{pgfpicture}
\DeclareSymbolFont{symbolsb}{OMS}{cmsy}{m}{n}
\SetSymbolFont{symbolsb}{bold}{OMS}{cmsy}{b}{n}
\DeclareSymbolFontAlphabet{\mathcal}{symbolsb}



\usepackage{pgfplots}


\usepackage{fontspec}
\usepackage{xeCJK}
\setCJKmainfont[ItalicFont=方正楷体简体]{思源宋体 CN}
\setCJKsansfont{思源黑体 CN}
\setCJKmonofont{方正楷体简体}


\begin{document}


\usetikzlibrary{intersections,calc,positioning}

\begin{tikzpicture}[scale=1]
\begin{scope}[rotate=18]
\def\n{5}
\pgfmathsetmacro\i{\n-1}
\foreach \x in {0,...,\i}
{
\def\pointname{\x}
\coordinate (\pointname) at ($(0,0) +(\x*360/\n:4cm)$)  ;
}
\end{scope}

\node[circle,draw] (huo) at (0) {火};
\node[circle,draw]  (mu) at (1) {木};
\node[circle,draw] (shui) at (2) {水};
\node[circle,draw] (jin) at (3) {金};
\node[circle,draw] (tu) at (4) {土};

\draw [-latex] (mu) to [bend left] node[above] {生}  (huo);
\draw [-latex] (huo) to [bend left=15] node[right] {生} (tu);
\draw [-latex] (tu) to [bend left=5] node[below] {生}   (jin);
\draw [-latex] (jin) to [bend left=15] node[left] {生} (shui);
\draw [-latex] (shui) to [bend left] node[above] {生} (mu);

\draw [-latex] (mu) to node[right] {克}  (tu);
\draw [-latex] (huo) to  node[below] {克} (jin);
\draw [-latex] (tu) to  node[below] {克}   (shui);
\draw [-latex] (jin) to  node[left] {克} (mu);
\draw [-latex] (shui) to  node[above] {克} (huo);

\end{tikzpicture}


\end{document}